
// Copyright (c) 2010-2021 niXman (github dot nixman at pm dot me). All
// rights reserved.
//
// This file is part of YAS(https://github.com/niXman/yas) project.
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
//
//
// Boost Software License - Version 1.0 - August 17th, 2003
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

#ifndef __yas__tools__hexdump_hpp
#define __yas__tools__hexdump_hpp

#include <yas/detail/tools/cast.hpp>
#include <yas/buffers.hpp>

#include <sstream>
#include <iomanip>

namespace yas {
namespace detail {

/***************************************************************************/

inline std::size_t chksum_crc32(const void *ptr, std::size_t length) {
	static const std::uint32_t crc32_table[] = {
		0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
		0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
		0x0EDB8832, 0x79DCB8A4, 0xE0D5E91E, 0x97D2D988,
		0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91,
		0x1DB71064, 0x6AB020F2, 0xF3B97148, 0x84BE41DE,
		0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7,
		0x136C9856, 0x646BA8C0, 0xFD62F97A, 0x8A65C9EC,
		0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5,
		0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
		0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B,
		0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940,
		0x32D86CE3, 0x45DF5C75, 0xDCD60DCF, 0xABD13D59,
		0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116,
		0x21B4F4B5, 0x56B3C423, 0xCFBA9599, 0xB8BDA50F,
		0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924,
		0x2F6F7C87, 0x58684C11, 0xC1611DAB, 0xB6662D3D,
		0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A,
		0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
		0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818,
		0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01,
		0x6B6B51F4, 0x1C6C6162, 0x856530D8, 0xF262004E,
		0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457,
		0x65B0D9C6, 0x12B7E950, 0x8BBEB8EA, 0xFCB9887C,
		0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65,
		0x4DB26158, 0x3AB551CE, 0xA3BC0074, 0xD4BB30E2,
		0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB,
		0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
		0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9,
		0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086,
		0x5768B525, 0x206F85B3, 0xB966D409, 0xCE61E49F,
		0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4,
		0x59B33D17, 0x2EB40D81, 0xB7BD5C3B, 0xC0BA6CAD,
		0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A,
		0xEAD54739, 0x9DD277AF, 0x04DB2615, 0x73DC1683,
		0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8,
		0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
		0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE,
		0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7,
		0xFED41B76, 0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC,
		0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5,
		0xD6D6A3E8, 0xA1D1937E, 0x38D8C2C4, 0x4FDFF252,
		0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B,
		0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6, 0x41047A60,
		0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79,
		0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
		0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F,
		0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04,
		0xC2D7FFA7, 0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D,
		0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A,
		0x9C0906A9, 0xEB0E363F, 0x72076785, 0x05005713,
		0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38,
		0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7, 0x0BDBDF21,
		0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E,
		0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
		0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C,
		0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45,
		0xA00AE278, 0xD70DD2EE, 0x4E048354, 0x3903B3C2,
		0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB,
		0xAED16A4A, 0xD9D65ADC, 0x40DF0B66, 0x37D83BF0,
		0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9,
		0xBDBDF21C, 0xCABAC28A, 0x53B39330, 0x24B4A3A6,
		0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF,
		0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
		0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D
	};

	std::size_t crc = 0xFFFFFFFF;
	const std::uint8_t *block = static_cast<const std::uint8_t*>(ptr);
	for ( std::size_t idx = 0; idx < length; ++idx ) {
		crc = ((crc >> 8) & 0x00FFFFFF) ^ crc32_table[(crc ^ *block++) & 0xFF];
	}
	return (crc ^ 0xFFFFFFFF);
}

} // namespace detail

/***************************************************************************/

inline std::ostream& hexdump(std::ostream &os, const void *buf, std::size_t len) {
	if ( !buf || !len ) return os;

	std::ios::fmtflags fmt(os.flags());

	const std::uint8_t *buffer = static_cast<const std::uint8_t*>(buf);
	// addr: 内存地址，假设buffer的开头地址为0
	// n: buffer中字符的位置索引
	// idx：当前行待打印的buffer字符的位置索引
	// cnt2：当前行打印的字符总数
	std::size_t addr = 0, n = 0, idx = 0, cnt2 = 0;
	for ( n = 0; n < len; ++n ) {
		if ( cnt2 == 0 ) {
			// 打印地址
			os << std::setw(7) << std::setfill('0') << addr << ": ";
			// 16：表示每行打印buf中的16个字节
			addr += 16;
		}
		cnt2 = (cnt2 + 1) % 18;
		if ( cnt2 <= 16 ) {
			os << std::hex << std::setw(2) << std::setfill('0') << __YAS_SCAST(std::size_t, buffer[n]) << ' ';
		} else {
			os << '|';
			// 设置填充字符为空格
			os << std::setfill(' ');
			for ( idx = n - cnt2 + 1; idx < n; ++idx) {
				// 注：ascii码小于32和大于126的，为不可打印的字符
				if ( buffer[idx] < 32 || 126 < buffer[idx] ) {
					os << '.';
				} else {
					os << buffer[idx];
				}
			}
			os << std::endl << std::dec;
			cnt2 = 0;
			n--;
		}
	}

	os << std::setfill(' ');

	// 最后一行不足16个字节时，16进制使用“--”代替
	for ( idx = cnt2+1; idx <= 16 ; ++idx ) {
		os << std::setw(2) << "-- ";
	}
	os << '|';

	for ( idx = n-cnt2; cnt2 <= 16 && idx < n; ++idx ) {
		if ( buffer[idx] < 32 || 126 < buffer[idx] ) {
			os << '.';
		} else {
			os << buffer[idx];
		}
	}

	// 后续通过该输出流输出的数据将以十进制的形式呈现
	os << std::dec;

	// 输出总字节数和crc校验码
	os << std::endl
	<< "LEN  : " << len << " bytes, "
	<< "CRC32: 0x" << std::hex << detail::chksum_crc32(buf, len);

	os.flags(fmt);

    return os;
}

inline std::ostream& hexdump(std::ostream &os, const intrusive_buffer &buf) {
    return hexdump(os, buf.data, buf.size);
}

inline std::ostream& hexdump(std::ostream &os, const shared_buffer &buf) {
    return hexdump(os, buf.data.get(), buf.size);
}

inline std::string hexdump(const void *ptr, std::size_t size) {
    std::ostringstream os;
    hexdump(os, ptr, size);

    return os.str();
}

inline std::string hexdump(const intrusive_buffer &buf) {
    return hexdump(buf.data, buf.size);
}

inline std::string hexdump(const shared_buffer &buf) {
    return hexdump(buf.data.get(), buf.size);
}

/***************************************************************************/

} // namespace yas

#endif // __yas__tools__hexdump_hpp
